Joseph sawyer



Patented Dec. i4, 188 0.

N.PETERS, PHOTd-UTHOGRAPHER, WASHINGTON. D30- J. SAWYERJ; Furnace il-UNITED STATES PATENT OFFICE.

J OS EPH SAWYER, OF LONDON, ENGLAND.

FURNACE.

SPECIFICATION formingpart of Letters Patent No. 235,458, dated December14, 1880. Application filed July 31, 1880. (No model.) Patented inEngland February 9, 1878.

by which they may becaused to slide in opposite directions. The bars areconnected alternately to one of these rocking bars, by which means, ifthe said lever-handles be operated in. opposite directions, the barswill have a to-and-fro motion communicated to them, each alternate barmoving in the opposite direction to the remainder, thereby clearing orbreaking up, by means of the semicircular projections, the clinkers andscoria, and also separating them, effecting a more perfect combustion ofthe fuel bykeepin gfree the air-spaces between the bars.

The bars are preferably made hollow, and have lateral openings for theadmission of air. But to make myinvention better understood,

I will proceed to describe the same by reference to the accompanyingdrawings, in which- Figure 1 is a longitudinal section, showing myimprovements in furnaces applied to an ordinary Cornish boiler. Fig. 2is a front elevation of the same, and Fig. 3 is a plan of thefire-grate.

Similar letters in all the figures represent similar parts.

a an a are the hollow furnace-bars formed with semicircular projections12 on their upper surfaces, and with lateral openings a as shown in Fig.1.

a c are the two rocking front bearing-bars. d and e are thelever-handles for operating the said rocking bars. The bars a areconnected to and operated by the rocking bar a by means of theprojections f taking into recesses in the under side of the front endsof the bars, the remaining bars a being connected with the rocking bar 0and operated in a similar manof which the following is a ner byprojections f. The outside bars, a are fixed.

g is a roller on which the bars rest. iis the dead-plate, which isplaced, as shown, some distance above the top of the bars, and extendsin front of the door; j, air-grating between the upper surfaces of thebars and the under side of the dead-plate for the admission of air tothe fuel. The back ends of the bars pass through openings in theguide-plate is under the bridge 1, and h h are guides for the front endsof the bars; or a guide or spacing-plate may be placed in any othersuitable position.

From this arrangement it will be understood that if the lever-handles dand e be operated in opposite directions the rookin g bars a 0 willcommunicate a backward and forward motion to the bars, the bars a movingin the opposite direction to the bars (1, thereby clearing or breakingup, by means of the semicircular projections b, the clinkers and scoria,and thus the air passes freely between the bars, and at the same time itis introduced through the grating j under the dead-plate i, and throughthe hollow bars out by the lateral openings a passing thoroughly intothe fuel, and effecting a more perfect combustion thereof andconsumption of the smoke.

It will be understood that when both levers are pushed back thesemicircular projections of the bars will correspond.

m is a chamber or jacket on the back of the furnace-door a, such chamberbeing open at the bottom, as shown in Fig. 1. 0- is a flap or valvepivoting at the upper part of the chamber mp 19 p p are perforations inthe furnacedoor a. q is a rack-handle connected to the flap or valve 0,and passing through an opening in the door, so as to allow of operatingthe flap o,- r, catch.

By this arrangement, if the flap 0 be closed against the door, as shownin Fig. 1, no air can pass through the perforations p 19 into thefurnace; but if the flap be opened into the position shown by the dottedlines the air will pass through the perforations p and down through thebottom of the chamber m into the furnace directonto the fuel.

Having thus described my said invention and the manner of performing thesame, I wish it to be understood that I do not confine the wholearranged and operating as and for the purposes set forth.

2. An air-grating located under the deadplate and above the grate-barsfor the admis- 15 sion of air to the furnace, as hereinbefore described,and shown in the accompanying drawings.

JOSEPH SAWYER. Witnesses:

G. F. REDFERN, A. ALBUTT. v

